Safety device for burners



May 31. 1927; I

- 's. DAHL SAEEIiY DEVICE FOR BURNBRS Filed April 8. 1925 TT42 s sheets-sheet 2 awuentoz /6 VHL 0 0/7/41.

mam M Patented May 31, 1927.

sIGvALn Banner M RvALL- PB. osLo, NORWAY, 'assrelvon crown-HALF To CHAROLD CARLSEN, OF BEOOKIJYLLLNEWYOBK, i

1 SAFETY DEVICE non BUnNEns.

This invention relates to an appliance adapted to prevent the removal of a burner while fuel is flowing through the same. lVhile not limitedthereto the device is par- :rigidly secured to theboiler front in any ticularly useful in connection with oil burners such as used for supplying fuel to marineboilers. V,

' It is known to-those skilled in the art that the burners of marine boilers are frequently removed for the purpose of cleaning'or making'repairs due to parts of the'- bu1'ner being-destroyed or rendered inefficient by the excessive heat'in the boiler, On shipboard it is frequently necessary] to remove the uburners several times per. hour. The removal of the burnersis a constant source of danger to those operating them because if I v M v 4 v valve is retracted fromits. seat, hence, the fuelisfree to flowi'from the pipe 36 to the pipe 30-andthrough the ducts 28 and16' andthence, to the interior f the boiler. I

through carelessness or lack of knowledge on the "subject the burner is removed without first, closing the valve which supplies fuel theretothe hot fuel will be discharged into the boiler room. The fuel oil used formost boilers is supplied under a high pressure and is frequentlypreheated .to a high tem- 'perature and many accidents have occurred on shipboard due to the removal of the burners without first cutting off the o l p ly, My ,nventlon aims to providev means xwhich will prevent the removal .of' the burner as long as fuelis flowing thereto but 7 will permit-suchremoval after the fuel supply has been cut on. Anembodiment of the invention is illustrated inithe accompanying drawings in which i Fig. 1 is a sectional view showing a burner and related parts provided with my mproved safety device;

Fig; 2 is a vertical, section online 2- 2of Fig. 1; p

Fig. 3 isa section on line 3 -3 of Fig. 1;

Fig, 4 is a View similar to Fig. 3 but showing the safety device in theposition it i takes after the fuel control valve is closed;

Fig. 5 is a horizontal section on line 5'5 V I p r the boiler front. 4 The member 56 has a hub of Fig. 3; I

Fig. 6 is a perspective detail view illustrating part of the mechanism shown at the right in Fig. 5. r

Referring in detail to the drawings, 10 represents a boiler front having an opening 12 therein through which projects a nozzle 14 of a known type of burner conventionally shown in Fig. land indicated as a whole by the numeral 15. This burner has a duct 16 the a burner.

Application filed April 8, 1925; I Seria1 1 To. ;21,564. i i

formed therein. The inletfl8 of this duct terminates at a seat20formed onthe burner' which is adapted to engage a mating seat 22 formedron the end of a fixture 24 which is suitable manner, for example, as indicated by screws 26. I, The fixture 24 base duct 28 thereinwhich registers with the duct 18. in I, p The duct 28 is conn-ected by means of pipe 30 and union 32 with a-globe valve 34which controls'the passage of oil or other fuel from the pipe 36. .The latter pipeis connected with a: suitable source of the burner 'under pressure according'to the usual practice.

As illustrated in Fig. -1,the plug 38 ofthe 'means in such a mannerthat-the burner can- 4 not be removedunless'the control valve 34 v .i sfclosed. This meansincludesra yoke-like v ,membeif40 which'is pivoted 301i a suitable :stud 42 secured to thefixture 24. p The outer end of the yoke v me'mber,4O hasa, hub 44 fo rm'ed thereon through which is threadeda clamp screw 46 havinga' bevelled end 48 adapted to engage a conical seat 50 formed .inthe burner. The outer end ofvthef clamp screw is formed with a square head 52 so as to afford a good purchase for a wrenclror other" toolffor manipulating the screw WVhenthe .valve 34' is in open position as supply, and the fuel is adaptedto; be fed to shown-in F ig. 1, accessto or rmanipulation of V the head 52.0f the clamp screw is, prevented by means of a guard portion-54 carried by a member 56' which is loosely pivoted onl'a 1 shaft 58 journalledfinisuitable brackets 60 v and 62 extending outwardly froina base plate 64 sec ured;by ,meansof screws 66 to portion which is formed with a tooth 68. A latch 7 0 pivoted at 72 to a lug 74 formed on the base plate, normally engages the tooth 68 and holds the guard member in the position shown in Figs; 1 and 3. The shaft 58 has rigidly secured thereto an arm 7 6 which carries at itsouter' end a pin 78 adapted at the proper time to strike the underside of the latch 70 so as to release the member 56.

niit accessfto the clamp screw 52.

The. shaft 581's operatively connected With the valve stem 80 of the valve Set-by means of a system of links and lovers in such away thatwhenthe valve stem is turned-in al-di rcction to close the same, at. the end-of-the closing movement the shaft 58 will have been rocked through a suflicient distance to bring the pin 7 8 into position to trip the latch 70 and thus cause the guard b t-to drop a'nd per- This released position is shown in Fig. at. The linkage for accomplishing the above includes a crank arm S-Q'carried on one end'o-f'the sha'ft 58 .whic h is connected by means ofa -li'nk84to the lower end of a lever 86 .pivoted' at 88to a suitable bracket 90. The upper "end of the link; SGis pivot-ally secured-tea rock shaft 58. As above mentionechwhen the valve is in closed position the guard member '56 Will'be in'ythe positionshown in Fig. 4, hence, the operator can unfasten the clamp screwetfi so as to remove the burner from the furnace for the purpose of cleaning orrenewing parts. And this-act Wlllbe unaccompaniedby danger to theoperator as no fuel can fiowfro m the duct, 28 While the valve is closed."

After theb urner has been cleaned *of repaired it is again put in p'osition rindicated "in Fig. 1 andthe clamp screw tightened up so as .tojseat the surfaces '20 and '22 firmly against one another The operator then turns the Valve stem 1n the proper direction 7 to open the valve. This action rocks the shaft58 in the directionofthe arrow 00 indicated in 4. I During'this turning move ment the member 56 1s caused'to partake of the turning movement of the shaft because of the engagement of a shoulder 104' formed "in a. collar 106 securedto theshat't with a projection 108 extending longitudinally, from the hub portion of the member '56; When *the valve reaches its-fully opened position,

the guard portion 54 of the member 56"en-' closes the end of the clamp. screw and the latch wil'ldrop into the position shown; in

Fig. 3' so as to holdthe partsinthe position shown until the valye is again closed;

From the above it is apparent my invention provides means which makes the insei= foolproof.- lSy its use the safety of work tion and removal of fuel burners practically menis insured and 'fire hazard is greatly diminished.

an installation, the utility of which has been demonstra-ted onboard ship. 'It is not'to be construed, however,' that the invent on is 'limited'to use on oil burners anduit will be The embodiment of the invenhon Illustrated and described corresponds to appreciated that it canbe readily adapted for use in connection vith other types of apparatus. i 1 Wlnle I have ClGSC-llbQClWYl'tll great particularity the embodiment of the invention illustrater tl, it is not to be construed that I am limitedathereto as modifications and sub- I stitutio'n of equivalents may be made by those skilled'in the art without departing from the invention as defined in the appended claims;

What I claim" is:

1. In combination with .a burner; a pipe, for supplying iueltthereto, means for detachably holding the burner in communication with said 131E671], valve 111 saidpipe havmga movable va;lve.stem',-a shaft arranged to be. I

actuated by said ,valve stem,a member loosel-y pivoted on said shaft andhaving a guard portion, a latch for normally holding 'said member in such position that the guardfportion prevents manipulation lots-aid holding, l

means and means I-for tripping said latch upontl-le' completion of the closing movement of sajdvalve stem. I

2; In combination with a marinefboiler, anoil burner and a pipe. for 'supply-ingv'oil thereto a fixture secured to "the boiler" front and having an inlet' passage connec-ted with saichpipe and an outlet passage communicat- "ing with said; burner, a manually operable clamp adapted, tofirmly seat the. burner against said'fixture, a valve controlling the flow of oil through saidlpipe a shaft. arranged to be rocked in opposite directions upon the opening and closing of said valve, a member loosely pivoted'on said shaft and having a portion normally preventing move-.

ment of said clamp, a latch engaging said pivoted member, and means.movableinwith said shaftfor tripping said latch.

In'wituess whereof, I have hereunto signed my name.

sievaLn nan-L, 

